Polish rod clamp



Sept. 19, 1939. c. w. CRISW ELL 1 2,173,355 POLISH non cmmr Filed Feb.24, 1938 I (M v I. 2 Charles W EPiEWEH Z 1 H m) 9 4% Patented Sept. 19,1939 V UNITED STATES PATENT POLISH ROD CLAMP Charles W. Criswell,Eureka, Kans.

Application February 24, 1938, Serial No. 192,389

2 Claims. (Cl. 24-249) The present invention relates to clamps or Figure4 is a plan view of the clamp, the polish gripping devices for thepolish rods of pumping rod being shown in horizontal section. oil orwater wells. Figure 5 is an enlarged vertical sectional view It issometimes desirable to render the pumpon the line of Figure 4:100king inthe direc- 5 ing mechanism of wells inoperative for pumping tion of thearrows. 5 purposes precisely upon the end of the upstrokes In thedrawing: A designates Surface portion of the polish rods, by suspendingthe polish rods, of an or Water Such as Stuffing box;

sucker rods, etc., on the surface parts of the B P011511 rod; ctaflmpconstructed wells, while the walking beams continue to move cordmg tothe present tnventtong for at least short periods of time. In order toac- The Clamp C D -Q am body portion 10 complish this, the clamp at theparticular well 5 preferably of t m p as tnctude' must be assembledabout the polish rod while it an abutment or blght portton t Provtdmg ismoving and rendered tight thereabout at the Prlght abutment Wall 8 forengagmg the POhsh right moment. Polish rod clamps have been prot andspatedpttrattet sttppurts 9; Shdttble posed which require the use ofwrenches to It for Qengagmg the pohsh t vertlca'uy operate threadedmembers of the clamps or other movable Wtth respect and .gutded by thesuptools to drive wedges, but in practice these have ports 8; 1 meains Ht t b the t t been found unsatisfactory at least to the extent 9 torcmgthe t It Into mttmate gnppmg that they are often difiicult to assembleabout reta'tmn to the pohsh the polish rods or cannot be operated to ripthe By way of m the body pottton t may be 20 polish rods at preciselythe moment when the tormed from a .plece of bat F bent at polish rodsreach the ends of the upstrokes. Its Central portlon so that i materfates .ttte

The present invention is designed to Overcome concavo-convex, thusproducing an arcuate bight these disadvantages and has among its severalportton t and spaced parttutt Supports Objects to provide a polish rodclamp which may 9, the lower faces I2 of WhlCh are in the same 25 bereadily and quickly assembled about the polish plane t upon Surface partthe Well as rod, say upon the stufiing box or other surface sttown mFigures 3 t It t a fitter part of the well, with comparative safety. andpiece t be.welded m thetont'avtt'y of t then operated without the use ofa wrench. hamblght pttrtton Instead of shapmg the conctwtty 3'0 mer orsimilar tool and without liability of movt preclsety the of t tough rodSurface 1t ing parts of the clamp rubbing on the supporting to engage Inthe exttmple shown t finer structure, to quickly and firmly grip thepolish t body portlon artuttte m cross rod at recisely the moment whenthe polish rod the Inner t of which Is Struck from has reached h end ofits upstroke a radius substantlally that of the polish rod 3;

and, a flange l5 engaging upon the upper face 5 ottter ob'tects of t t tntovlde of the bight portion 1 where it may be welded 3 a polish rodclamp which is light in weight, has

as at it. The body portion M of the filler piece ample strength for theservlce recommended may be of less height than that of the main body andeasily Operatedportion 6 of the clamp, as shown in Figure 3, 40 F rt erO ject and advantages the inVeTland welded at its lower end to the bightportion 40 i W app in h following detalled d p- 1, as at I1. Thisconstruction makes possible the tion, taken in connection with theaccompanying production of filler pieces of different sizes, saydrawing, forming apart of this specification, and for polish rodsranging from to 1 and a in which drawingselected filler piece, for theparticular size polish Figure l is a perspective View of a polish rodrod, welded or made integral with the bight porclamp constructedaccording to my invention tion Hi. It also permits of the selection ofa. shown in gripping relation to a polish rod. metal for the fillerpiece suitable for gripping Figure 2 is a side elevation of the clamp,showthe polish rod without liability of damaging same ing itsrelationship to a polish rod and support and which metal may bedifferent from that used when the device is not in clamping relation tothe in making the bight portion 1 and arms 9. In polish rod. the exampleshown the arms or supports 9 are Figure 3 is a view partly in elevationand partly provided with aligned circular openings M for in verticalsection showing the relative position a purpose to be subsequently setforth. of the parts when the device is in gripping rela- The slidablejaw 10 may also be made of a tion to the polish rod. metal suitable forgripping the polish rod B with 55 least liability of damaging, and inthe example shown comprises a polygonal body portion I9 of a size to fitfreely between the arms or supports 9, and lateral flanges adapted torest and slide upon the upper faces 2! of the arms or supports 9. Thisarrangement enables a workman to drop the jaw I0 into place after theremainder of the clamp has been assembled about the moving polish rod.The body portion l9 preferably has a concaved face 22 struck from aradius substantially that of the radius of the polish rod B; an oppositeflat face 23 upon which means i 1 acts; and parallel side faces 24 forconfronting relation to the inside faces 25 of the arms or supports 9.The body portion l9 terminates as at 25, short of the plane of thebottom faces l2 of the arms or supports 9, as shown in Figures 2, 3 and5, so that no portion of the jaw It! engages the surface portion A ofthe well upon which the main body portion 6 rests. The jaw I8 is thenthus free to move toward the polish rod without that friction whichwould occur if the body portion l9 terminated in the plane of the lowerfaces [2 of the arms or supports 9.

In the example shown, the means H preferably includes a cam 21, having acircular opening 28; a lever 29 rigid with the cam; a bolt 30 includinga shank 3!, a head 32 and an eye 33 on the head 32; and, a cotter key 34received in a transverse opening 35 in the end of shank 30 opposite head32. The shank 3! is detachably received in the openings I 8 of arms orsupports 9 and the opening 28 in cam 21. It is preferred to extend thelever 28 from the cam 27 in such relationship to the throw side 3'3 ofthe cam that when the lever 29 is upright, the throw side 3! of the camis remote from the space occupied by the jaw I8, thus leaving ample roomto drop the jaw H] into place, and when the lever 28 is swung away ordownwardly from the polish rod B, the throw side 86 of the cam 2'! actsupon the face 23 of jaw l0 and forces it into intimate, grippingrelation to the polish rod B. While I have shown in the drawing a stublever 29, it is to be understood that this is merely by way of example,and that an extension, not shown in the drawing (such as a piece ofpipe) may be placed on the stub lever to facilitate operation of theclamp.

When using the clamp, the workman, preparatory to assembling the clampin proper relationship to the polish rod, removes the slidable jaw [0from the main body portion 6, and dismembers the means H to the extentthat the cotter key 34, the bolt 30 and the cam 21 are disconnected fromthe main body portion 6. The main body portion is then placed inembracing relation to the polish rod B, which may be moving up and down.Then means H is reassembled, and holding the lever 29 upright, the jawl0 may be dropped into place intermediate the cam and polish rod. Byclose observation of the walking beam or other part of the motiontransmitting means, the lever 29 may be swung downwardly at preciselythe end of the upstroke of the polish rod, gripping the polish rod so asto suspend it and the parts carried thereby, on the surface portion ofthe well.

I claim:

1. A polish rod clamp comprising a body part substantially U-shaped inplan, including a bight portion and arms to lie in embracing relation tothe polish rod and engage upon a surface portion of the well, a fillerpiece secured to said bight portion and having a concaved face struck ata radius substantially equal to the radius of the polish rod, a jawslidable between and supported by said arms, said jaw terminating shortof the plane of the bottoms of said arms and also having a concaved facestruck at a radius substantially equal to the radius of the polish rodfor engaging the rod at its side opposite said bight portion; and, meanscarried by said arms for forcing said jaw into intimate contact with thepolish rod.

2. A polish rod clamp comprising a body part substantially U-s haped inplan, the bight portion of which to abut one side of the polish rod andthe arms to lie in embracing relation to the polish rod and engage upona surface portion of the well, a jaw for engaging said polish rod at itsside opposite said bight portion, said jaw extending loosely betweensaid arms, movable toward and from said polish rod, terminating short ofthe plane of the bottoms of said arms and provided with side flangesengaging and slidable along the top faces of said arms, whereby the jawmay be vertically placed or removed with respect to the body part of theclamp, and means detachably carried by the free end portions of saidarms for forcing said jaw toward said bight portion and into intimatecontact with the polish rod.

CHARLES w. CRISWELL.

